C drive losing space fast each time I try to use Unreal Engine although EVERYTHING is on a different drive!

As Seen in this Pic each UE version is 15gb To 17gb


Why Unreal stores every version on a drive location you haven’t installed too beats me, defeats the purpose of installing to other drives if your going to hog all my windows drive storage space.
How can you get rid of these other versions safely without destroying all versions, the files are in batch versions under one common file with only numbers 0 through 9.